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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d187300795168342579f5385f4956a6009803b19f6dc6bf3416d08a4efe6956' 
  AND token = 'KjXs5aKp8Fa42nIWZRC447LJOpYEB/OqF8AQ0z8IcY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}